Nobuaki Kitano

Fabrication and investigation of fast response variable optical attenuator on silica substrate

We have developed fast response variable optical attenuator (VOA) on silica substrate by analyzing thermal response using equivalent circuit. The response time and power consumption are 2.5 msec and 100 mW respectively

Fundamental investigation on transparent replicated mold using an organic-inorganic hybrid material

This paper investigates a replication process using the organic-inorganic hybrid material. The condition of heat treatment was determined on the basis of the hardness and transmission measurements. 100 repeated imprints were demonstrated using the replicated mold and achieved good fidelity.

Design and the Fabrication of a Multi-Level Phase Hologram Using Subwavelength-Scale Hole Array Structures

The three-level phase hologram with 128 x 128 pixels of 10-μm square, 500-nm pitch hole array structures is fabricated. The clear diffracted image is generated for the light with a wavelength of 780 nm.